The recent upgrade of Pokemon Go does not work with a VPN. It appears they are blocking VPN traffic.
curbi uses a VPN to filter internet traffic from a device. You can turn it off, but if you do no usage is recorded while it is off, nor can any content filtering or category based rules work.
If the VPN is off, you can still use "Block All" rule and "Timeout" together with App Hiding to block the device at bedtime or throughout the day using any type of rule.
If you want to test this out, you can turn off the VPN from the curbi parent app or web app and navigating to the Device tab > and then turn OFF Internet Filtering.
Android devices don't use a VPN so they should work with Pokemon Go.
Screen shot show Internet Filter OFF